•Spectral Class and Temperature
•Short Main-Sequence Lifespan
I believe the answer is: valid, but not reliable
A result would be considered as valid if it is created by using proper logical thought or common way of reasoning. But, such result on personality would not be considered to be reliable because there are too many factors that could create a deviation within the data, and there is no accurate way to truly measure personality.
Cultural capital concerns certain types of skills that are developed by children, these skills are passed from parents to children, usually parents of the social middle class. Reading skills, watching documentaries, playing classical instruments. These children have better academic development than others.
People with cultural capital skills always get people's attention, stand out, unlike those who don't, who aren't seen as capable by society.